cause for fairy circles — natural geochemical conditions such as plant-killing carbon monoxide seeping out of the earth — say they already knew about Newman. Analytical chemist Yvette Naudé of the University of Pretoria in South Africa says she and her colleagues got a tip about five years ago from a fairy circle enthusiast in Switzerland and realized that the site is visible via Google Earth. Without studying the Australian fairy circles in person,
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For any explanation of fairy circles, correlation is not causation, says Walter Tschinkel of Florida State University in Tallahassee. Final proof will require an experiment that uses the proposed cause to create fairy circles. How to do that for features that stretch over whole landscapes,
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For the second time,
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